Why isn't my animation moving when played?
Insert more key frames.
For example:

at frame 0 :   0 degrees rotation

at frame 2 : 144 degrees rotation

at frame 4 : 288 degrees rotation

at frame 5 :   0 degrees (360 degrees) rotation

Be aware also that 5 frames is just 1/5th (0.2) of a second at normal animation rates, so your prop is going fully rotate 5 times a second.